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2025年07月08日 15時33分39秒
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<div class="identifier-type">concept</div><div class="header"><iterator></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">indirectly_copyable_storable</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">In</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Out</span><span class="o">></span>
<span class="w"> </span><span class="k">concept</span><span class="w"> </span><span class="nc">indirectly_copyable_storable</span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n"><a href="indirectly_copyable.html">indirectly_copyable</a></span><span class="o"><</span><span class="n">In</span><span class="p">,</span><span class="w"> </span><span class="n">Out</span><span class="o">></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="indirectly_writable.html">indirectly_writable</a></span><span class="o"><</span><span class="n">Out</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>&></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="indirectly_writable.html">indirectly_writable</a></span><span class="o"><</span><span class="n">Out</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>&></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="indirectly_writable.html">indirectly_writable</a></span><span class="o"><</span><span class="n">Out</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>&&></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="indirectly_writable.html">indirectly_writable</a></span><span class="o"><</span><span class="n">Out</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>&&></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="../concepts/copyable.html">copyable</a></span><span class="o"><</span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="../concepts/constructible_from.html">constructible_from</a></span><span class="o"><</span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="iter_reference_t.html">iter_reference_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>></span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span><span class="n"><a href="../concepts/assignable_from.html">assignable_from</a></span><span class="o"><</span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>&</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="iter_reference_t.html">iter_reference_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">>></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>indirectly_copyable_storable</code>は、型<code>In, Out</code>が<code><a href="indirectly_copyable.html">indirectly_copyable</a></code>の関係にあり、<code><a href="iter_value_t.html">iter_value_t<In></a></code>型の中間オブジェクトを介しても、<code>In</code>から<code>Out</code>へその要素のオブジェクトがコピー可能であることを表すコンセプトである。</p>
<p>単純には、型<code>In, Out</code>のオブジェクトをそれぞれ<code>in, out</code>とすると次のような代入が可能であることを表している。</p>
<p><div class="codehilite"><pre><span></span><code><span class="k">const</span><span class="w"> </span><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">></span><span class="w"> </span><span class="n">tmp</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">*</span><span class="n">in</span><span class="p">;</span>
<span class="o">*</span><span class="n">out</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">tmp</span><span class="p">;</span>
</code></pre></div>
</p>
<h2>モデル</h2>
<p>間接参照可能な型<code>In</code>のオブジェクト<code>i</code>について次の条件を満たす場合に限って、型<code>In, Out</code>は<code>indirectly_copyable_storable</code>のモデルである。</p>
<p>次のように初期化された<code>obj</code>は、その以前に<code>*i</code>が示していた値と等しい（<em>equal</em>）。</p>
<p><div class="codehilite"><pre><span></span><code><span class="n"><a href="iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">In</span><span class="o">></span><span class="w"> </span><span class="n">obj</span><span class="p">(</span><span class="o">*</span><span class="n">i</span><span class="p">);</span>
</code></pre></div>
</p>
<p><code><a href="iter_reference_t.html">iter_reference_t<In></a></code>が右辺値参照型の場合、この初期化の後で<code>*i</code>が示す値は有効だが<a class="cpprefjp-defined-word" data-desc="未規定の動作。事前の断りなく処理系によって異なる動作をする" href="../../implementation-compliance.html#dfn-unspecified-behavior">未規定</a>な状態となる。</p>
<h2>例</h2>
<p><div class="yata" id="7a507ef5326427b18457ec24a672d488d550e099"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../concepts.html"><concepts></a></span>
<span class="cp">#include <a href="../iterator.html"><iterator></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="cp">#include <a href="../memory.html"><memory></a></span>
<span class="k">template</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">In</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">Out</span><span class="o">></span>
<span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::indirectly_copyable_storable</span></span><span class="o"><</span><span class="n">In</span><span class="p">,</span><span class="w"> </span><span class="n">Out</span><span class="o">></span>
<span class="kt">void</span><span class="w"> </span><span class="n">f</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">nameIn</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">nameO</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">nameIn</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" is indirectly_copyable_storable "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">nameO</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="p">}</span>
<span class="k">template</span><span class="o"><</span><span class="k">typename</span><span class="w"> </span><span class="nc">In</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">Out</span><span class="o">></span>
<span class="kt">void</span><span class="w"> </span><span class="n">f</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">nameIn</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">nameO</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">nameIn</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">" is not indirectly_copyable_storable "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">nameO</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="p">}</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">del_copy_ctor</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">del_copy_ctor</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">del_copy_ctor</span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
<span class="p">};</span>
<span class="k">struct</span><span class="w"> </span><span class="nc">del_copy_assign</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">del_copy_assign</span><span class="o">&</span><span class="w"> </span><span class="k">operator</span><span class="o">=</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">del_copy_assign</span><span class="o">&</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">delete</span><span class="p">;</span>
<span class="p">};</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="kt">int</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">*</span><span class="w"> </span><span class="k">const</span><span class="o">></span><span class="p">(</span><span class="s">"int*"</span><span class="p">,</span><span class="w"> </span><span class="s">"int* const"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n"><a href="../memory/unique_ptr.html">std::unique_ptr</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="o">*></span><span class="p">(</span><span class="s">"<a href="../memory/unique_ptr.html">std::unique_ptr</a><int>"</span><span class="p">,</span><span class="w"> </span><span class="s">"int*"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="kt">int</span><span class="o">>::</span><span class="n">iterator</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../memory/unique_ptr.html">std::unique_ptr</a></span><span class="o"><</span><span class="kt">int</span><span class="o">>></span><span class="p">(</span><span class="s">"<a href="../vector/vector.html">std::vector</a><int>::iterator"</span><span class="p">,</span><span class="w"> </span><span class="s">"<a href="../memory/unique_ptr.html">std::unique_ptr</a><int>"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="kt">int</span><span class="o">>::</span><span class="n">iterator</span><span class="o">></span><span class="p">(</span><span class="s">"std::istream_iterator<int>"</span><span class="p">,</span><span class="w"> </span><span class="s">"<a href="../vector/vector.html">std::vector</a><int>::iterator"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="ostream_iterator.html">std::ostream_iterator</a></span><span class="o"><</span><span class="kt">int</span><span class="o">>></span><span class="p">(</span><span class="s">"std::istream_iterator<int>"</span><span class="p">,</span><span class="w"> </span><span class="s">"<a href="ostream_iterator.html">std::ostream_iterator</a><int>"</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">;</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="kt">int</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="o">*></span><span class="p">(</span><span class="s">"int*"</span><span class="p">,</span><span class="w"> </span><span class="s">"const int*"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n"><a href="ostream_iterator.html">std::ostream_iterator</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o"><</span><span class="kt">int</span><span class="o">>></span><span class="p">(</span><span class="s">"<a href="ostream_iterator.html">std::ostream_iterator</a><int>"</span><span class="p">,</span><span class="w"> </span><span class="s">"std::istream_iterator<int>"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n">del_copy_ctor</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="n">del_copy_ctor</span><span class="o">*></span><span class="p">(</span><span class="s">"del_copy_ctor*"</span><span class="p">,</span><span class="w"> </span><span class="s">"del_copy_ctor*"</span><span class="p">);</span>
<span class="w"> </span><span class="n">f</span><span class="o"><</span><span class="n">del_copy_assign</span><span class="o">*</span><span class="p">,</span><span class="w"> </span><span class="n">del_copy_assign</span><span class="o">*></span><span class="p">(</span><span class="s">"del_copy_assign*"</span><span class="p">,</span><span class="w"> </span><span class="s">"del_copy_assign*"</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>int* is indirectly_copyable_storable int* const
<a href="../memory/unique_ptr.html">std::unique_ptr</a><int> is indirectly_copyable_storable int*
<a href="../vector/vector.html">std::vector</a><int>::iterator is indirectly_copyable_storable <a href="../memory/unique_ptr.html">std::unique_ptr</a><int>
std::istream_iterator<int> is indirectly_copyable_storable <a href="../vector/vector.html">std::vector</a><int>::iterator
std::istream_iterator<int> is indirectly_copyable_storable <a href="ostream_iterator.html">std::ostream_iterator</a><int>
int* is not indirectly_copyable_storable const int*
<a href="ostream_iterator.html">std::ostream_iterator</a><int> is not indirectly_copyable_storable std::istream_iterator<int>
del_copy_ctor* is not indirectly_copyable_storable del_copy_ctor*
del_copy_assign* is not indirectly_copyable_storable del_copy_assign*
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++20</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../implementation.html#gcc">GCC</a>: 10.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2019 Update 6 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><a href="../../lang/cpp20/concepts.html">C++20 コンセプト</a></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0896r4.pdf" target="_blank">P0896R4 The One Ranges Proposal (was Merging the Ranges TS)</a></li>
</ul></div>
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